Source Emissions Test Report

for Barrick Goldstrike Mines, Inc.:

Carlin, Nevada Facility

Multi-Metals Testing – EPA Method 29

System 15 – Roaster Mill Circuit #1, System 16 – Ro aster Mill Circuit #2, System

18 – Roaster #1 and #2, System 19A – Roaster #1 Que nch Tank, System 19B –

Roaster #2 Quench Tank, System 61 – Carbon Reactiva tion Kiln #2 Drum,

System 66A – Autoclave #1, System 66B – Autoclaves #2 and #3, System 66C –

Autoclave #4, System 66D – Autoclaves #5 and #6, Sy stem 67A – Mercury

Retort #1, System 67B – Mercury Retort #2, System 6 7C – Mercury Retort #3,

System 68 – East and West Furnace, and System 70 – Assay Furnaces

Report prepared for:

Barrick Goldstrike Mines, Inc.

P.O. Box 29

Carlin, Nevada 89803

Report prepared by:

Air Pollution Testing, Inc.

5530 Marshall Street

Arvada, Colorado 80002

APT Project: BAR9144

## Certification

Team Leader Certification:

I certify that all of the sampling and analytical p rocedures and data presented in

this report are authentic and accurate.

Alex Mongold

B. S. Environmental Science

Field Team Leader / Senior Project Manager

Reviewer Certification:

I certify that all of the testing details and concl usions are accurate and valid.

Karl Breuer

B. S. Earth Science / Environmental Science

Reviewer / Senior Technical Writer

## Test Log Notes

• System 66 exhibited high moisture content in efflu ent gases which can

skew isokinetic sampling data and inhibit PM sample collection. To

minimize this effect, volumetric flow sampling cond ucted at System 66

utilized a heated (~250F) glass orifice with gas fl ow to monitor sample flow

rate. This change to the reference method was appr oved by the State of

Nevada for the concurrent mercury testing.

• Some runs were repeated when the isokinetic calcul ations determined that

the runs were not within acceptable isokinetic spec ifications and were

therefore invalid runs.

• Sampling at Autoclave 1 was conducted from one por t due to a building

obstructing access to the second port. This change from the reference

method was approved for the concurrent mercury test ing on-site by Mr.

Julio Sandoval of the Nevada Division of Environmen tal Protection.

• Stack gas velocity measurements at the System 67 M ercury Retort stacks

were conducted using EPA Method 2A due to the small diameter of the

stacks that did not allow conventional Method 5 sam pling techniques. The

velocity of the stack gas was measured before and a fter particulate

sampling and the pre and post measurements were wit hin 10% of each

other. A cyclonic flow check was not conducted on these sources due to

the very low flow, small stack diameter and the use of a standard pitot to

measure flow.

• The following process anomalies occurred during em issions testing: On

7/13/09, the second test run on System 19A was paus ed at 13:30 for 3.6

hours due to a plant down. On 7/13/09, the second test run on System

19B was paused at 13:30 for 3 hours due to a plant down. On 7/23/09,

the first test run on System 66B was paused at 10:5 2 for four hours due to

a plant down.

## Table of Contents

1. Introduction....................................

................................................... ........ 1

2. Summary of Results..............................

................................................... . 2

3. Methods.....................

..................................................... ..................... 18

4. Test Program Summary....................................

..................................... 19

5. Test Method Details...............................

.................................................. 20

Tables

Table 1.1 : Contact Personnel...

................................................... .......... 1

Table 1.2 : Emission Unit Identification...........

........................................ 2

Table 2.1 : S15 Roaster Mill #1 Test Results Summar y...............

....... 4

Table 2.2 : S16 Roaster Mill #2 Test Results Summar y...............

....... 5

Table 2.3 : S18 Roaster Exhaust Test Results Summar y............

........ 6

Table 2.4 : S19A Roaster #1 Quench Tank Test Result s Summary...

... 7

Table 2.5 : S19B Roaster #2 Quench Tank Test Result s Summary...

... 8

Table 2.6 : Carbon Reactivation Kiln #2 Test Result s Summary............ 9

Table 2.7 : S66A Autoclave 1 Test Results Summary......

.................. 10

Table 2.8 : S66B Autoclave 2/3 Test Results Summary

.................... 11

Table 2.9 : S66C Autoclave 4 Test Results Summary......

............... . 12

Table 2.10 : S66D Autoclave 5/6 Test Results Summar y..................

.. 13

Table 2.11 : S67A Mercury Retort #1 Test Results Su mmary............

.. 14

Table 2.12 : S67B Mercury Retort #2 Test Results Su mmary.............. 15

Table 2.13 : S67C Mercury Retort #3 Test Results Su mmary.............. 16

Table 2.14 : S68 East/West Furnace Test Results Sum mary............... 17

Table 2.15 : S70 Assay Lab Furnace Test Results Sum mary.............. 18

Table 4.1 : Sampling and Analytical Methods Summary

....................... 19Appendices

Testing Parameters and Sample Calculations.........................

......... Appendix 1

Field Data..........................................................................

....... Appendix 2

Laboratory Data......................................................................... Appendix 3

Calibration Information................................................................ Appendix 4

Schematics.............................................................................. Appendix 5